Pneumonia (Pathogens)

Commonly Encountered Pathogens by Risk Factor

• Alcoholism
  • Streptococcus pneumoniae
  • Anaerobes (e.g. Klebsiella pneumoniae)
  • Mycobacterium tuberculosis
• COPD and/or Smoking
  • S. pneumoniae
  • Haemophilus influenzae
  • Moraxella
  • Legionella
• Nursing Home
  • S. pneumoniae
  • Gram-negative bacilli
  • H. influenzae
  • Staphylococcus aureus
  • Anaerobes
  • Chlamydia pneumoniae
• Exposure to bird droppings
  • Histoplasma capsulatum
• Exposure to birds
  • Chlamydia psittaci
• Exposure to rabbits
  • Francisella tularensis
• Exposure to farm animals
  • Coxiella burnetii (Q fever)
• Exposure to southwestern US
  • Coccidiomycosis (Valley fever)
    
• HIV
  • Early
    • S. pneumoniae
    • H. influenzae
    • M. tuberculosis
  • Late (as above, plus:)
    • Pneumocystis jiroveci (formerly Pneumocystis carinii)
    • Cryptococcus
    • Histoplasma species
• Aspiration
  • Anaerobes
• Structural Lung Disease (CF, bronchiectasis)
  • Pseudomonas aeruginosa
  • Burkholderia (Pseudomonas) cepacia
  • S. aureus
• Injection Drug Use
  • S. aureus
  • Anaerobes
  • M. tuberculosis
  • S. Pneumo
• Influenza
  • Influenza
  • S. pneumoniae
  • S. aureus
  • H. influenzae

See Also

Pneumonia

Pneumonia (Port Score)